6 guys in 14 days amounts to a full of 6 times 14 or 84 man-days of work-related to achieve one task.
That suggests the proportion of work to man-days is 1/84 (1 job in 84 man-days) or, flipping it over, 84 man-days is forced to complete 1 task (or 84/1).
If you divide that ratio (84/1 or just 84 man-days) by the 21 days, the days on peak cancels the days on bottom and dividing the numbers (84/21) results in 4 men/task. So it takes 4 guys per task or 4 guys to finish the job in the 21 days.
You are watching: If 6 men can do a piece of work in 14 days, how many men are needed to do the work in 21 days?
Note that prevalent feeling tells you that if 6 have the right to perform the task in 14 days, it will certainly take less males to do the exact same task in the longer time (if tbelow were more than 6 men, and also they worked the same amount, then they would certainly obtain the project done faster than the 14 days).
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